绿色环保型表面活性剂驱油体系研究

Research on Green Surfactant Flooding Systems

考察了绿色环保型表面活性剂YCH-601及其复配体系的驱油性能。生物毒性评价实验表明YCH-601无毒、无皮肤刺激及过敏反应,属于绿色环保型表面活性剂。YCH-601及其复配体系室内评价实验结果表明,与其他几种油田常用表面活性剂相比,YCH-601对原油的乳化效果较好;在砂岩表面的吸附量较低,其稳定的动态吸附量为0.123 mg/g砂;YCH-601降低表面张力效果最好,使用浓度最低,其最低表面张力为26.7 mN/m。YCH-601复配体系AON、ASN体系降低油水界面张力效果较好,耐Na+能力分别为20、50 g/L,耐Ca2+能力分别为1500、4000 mg/L,并且经150℃高温处理后,油水界面张力仍在10-3mN/m数量级。YCH-601及其复配体系提高采收率效果好于其他表面活性剂,采收率高达22.5%。

The oil displacement properties of an environment friendly surfactant named YCH-601 and its combination system were studied. Biological toxicity evaluation test showed that YCH-601 had no toxicity, no skin irritation and no allergic reaction. The laboratory experiment results showed that YCH-601 had a better emulsifying capability to crude oil than that of usual surfactants used in oilfield. And the absorption of YCH-601 on the surface of sandstones was lower with a sustained dynamic absorption of 0. 123 mg/g sand. Compared with other surfactants, surface tension reducing effect of YCH-601 was the best with the lowest working concentration, whose lowest surface tension was of 26.7 mN/m. Its combination systems of AON and ASN, which could reduce surface tension effectively, provided high resistance to Na＋ which concentration was of 20 g/L and 50 g/L respectively, and that to Ca2＋ was of 1500 mg/L and 4000 mg/L respectively. Moreover, after treated with high temperature of 150℃, both systems could still reduce the oilwater interfacial tension to the order of 10-3mN/m. Both YCH-601 and its combination systems could enhance the oil recovery better that other surfactants, and the enhanced oil recovery was as high as 22.5%.